The shrimp in this Thai green curry are coated with lemongrass paste, cilantro, coriander, cumin, and lime zest.
Place chopped chiles, lemongrass paste, cilantro, coriander and cumin seed, and salt in a food processor. Zest lime; add. Puree until smooth, adding water a tablespoon at a time if necessary; set aside. Bring a pan of water to a boil. Add noodles; cook until just tender, about 5 minutes. Drain; set aside in bowl of cold water.
Heat oil in a large nonstick skillet over medium heat. Add lemongrass mixture, and cook until fragrant, about 1 minute. Add onion; cook until just softened, 6 to 8 minutes. Add bell pepper; cook until just tender, about 3 minutes. Combine cornstarch with water; add to pan. Add pineapple, mushrooms, and coconut milk; simmer. Add shrimp; cook until pink and opaque. Squeeze juice from lime; stir into mixture. Serve garnished with sliced chiles, if desired.